Speaker
Description
Efficient acceleration has been demonstrated using dielectric waveguides driven by multi-cycle THz pulses. Further improvements were achieved by employing sequential THz sources and waveguide structures, enabling cascaded acceleration . The cascaded THz-driven dielectric electron accelerator proposed here provides enhanced acceleration efficiency while enabling electron bunch compression. A multi-cycle THz pulse is coupled into a dielectric-lined waveguide, where the dielectric thickness is chosen to ensure phase-velocity matching for efficient acceleration. After the electrons exit the first acceleration stage, they are guided along a curved trajectory into a second waveguide using a magnetic chicane, while the THz pulse propagates in a separate waveguide. By synchronizing the electron path with the THz pulse propagation, further post-acceleration is achieved. According to our calculations, using 0.165 THz pulses with a peak electric field of 500 kV/cm (in the waveguide), a 300 keV electron bunch with an initial duration of 85 fs (@FWHM) is accelerated such that a substantial fraction of the bunch reaches energies close to 750 keV at the end of the second acceleration stage, while the bunch duration compresses to 75 fs** .
Footnotes
- E. Nanni et al., Nat. Commun. 6, 8486 (2015)
** D. Zhang et al., Phys. Rev. X 10, 011067 (2020).
*** Z. Tibai et al., under preparation
Funding Agency
This work was supported by the University of Pécs (grant ID 003_2025_PTE_RK/61 to Z.T.) and TWAC project, which is funded by the EIC Pathfinder Open 2021 (101046504).
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